17 



greatest width of the subcostal space distally, and the very strong 

 development of the media. It is unfortunate that the actual origins 

 of Ml and M3 with M2 should be obliterated. It is quite possible 

 that, as in Metalleutica, a short distal radial sector may have been 

 present, arising beyond the distal end of the preserved portion. 



MEASUREMENTS : Length of preserved portion of radius 39 

 mm., greatest breadth of fragment 18 mm. 



TYPE : Spec, la (Plate 5. fig. 2). TYPE-COUNTERPART : 

 Spec. 16. (B. D. Coll.) 



OBS. : The remarks made upon the significance of the genus 

 Mesorthopteron apply with some modification to Mesomantidion also. 

 If we decide to class as Protorthoptera all those fossils which cannot 

 be definitely placed in our recent Orthopterous families, but still 

 possess an undoubted Orthopteroid structure, we shall be right in 

 including both these genera in that ancient order. Nevertheless, 

 Mesomantidion is nearer to a definite phylo genetic connection between 

 the Protorthoptera and recent Mantoidea, just as Mesorthopteron 

 helps to bridge the gap between the Protorthoptera (and incidentally 

 also the Palseodictyoptera) and the recent Locustoidea. Further 

 discoveries along these interesting lines in the Queensland Trias may 

 be awaited with much interest. 



Order COLEOPTERA, 



Family HYDROPHILID^ (?). 

 Genus ADEMOSYNE, Handlirsch (1908). 



This genus was formed by Handlirsch for the reception of the 

 two species of Coleoptera figured by Etheridge and Olliff* from 

 Ipswich, Queensland, as Hydrophilidae. The type species A. major, 

 Handlirsch, is said by him to resemble closely the Liassic genus 

 Nannoodes. It is a rather small, somewhat heart-shaped beetle, 

 about 4.5 mm. long. 



In this genus a number of forms have been placed which agree 

 in having the elytra sculptured with from six to nine fine striae, and 

 with or without punctures. The interstices are usually low, smooth 

 (punctate in A. punctata) or slightly raised. If they are really 

 .aquatic beetles (as may be assumed from their comparative abun- 

 dance) they would go equally well into either Hydrophilidse or 

 Parnidse. The two large species, A. tumida and A. Cameroni, also 

 appear to show very great resemblance to elytra seen in many species 



* Loc. cit., pi. 2, fig. 6 (A. major), fig. 7 (A. minor) 



